Method for repairing the inner surface of a nuclear reactor shroud, shroud obtained by said method

A repair method and technology for nuclear reactors, which are applied in the field of maintenance of nuclear reactors and can solve problems such as inability to achieve weld volume inspection.

Active Publication Date: 2017-12-01
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The method in EP691658 cannot realize the volume inspection of weld seam (volume inspection)

Method used

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  • Method for repairing the inner surface of a nuclear reactor shroud, shroud obtained by said method
  • Method for repairing the inner surface of a nuclear reactor shroud, shroud obtained by said method
  • Method for repairing the inner surface of a nuclear reactor shroud, shroud obtained by said method

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Embodiment Construction

[0033] In one exemplary embodiment, the enclosure is a tank that houses a nuclear reactor core (ie, a nuclear fuel assembly). Hereinafter, it is designated by the acronym RPV (Reactor Pressure Vessel). In this case, the hood comprises a dome-shaped lower bottom carrying the trough bottom penetration. The groove bottom penetration structure is a hole arranged in the bottom of the dome-shaped groove, and a pipe body is arranged in a sealable manner in the hole, so that the measuring probe can be introduced into the groove and the detector can be removed from the groove. removed from the slot. These detectors enable measurements of neutron flow or temperature within the reactor core.

[0034] The tank also includes a tank cover with a plurality of holes in which a tap is sealably secured. These cocks allow passage of thermocouples or mechanisms for moving control rods.

[0035] According to another exemplary embodiment, said enclosure is part of a pressurizer and includes an ...

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PUM

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Abstract

The method comprises the following steps: - depositing a buttering (19) with a closed contour on the inner surface (3) around the defined area (1); installing a cap (27) at the defined area (1); forming a weld (29) to weld the cap (27) to the buttering (19). The cap (27) comprises a concave area (31), the concavity of which is turned away from the defined area (1), the method comprising a step of radiographically inspecting the weld (29), carried out by placing a radioactive source (33) in the concave area (31).

Description

technical field [0001] The present invention generally relates to maintenance of nuclear reactors. Background technique [0002] More specifically, according to a first aspect, the invention relates to a method of repairing a defined area of ​​the inner surface of a nuclear reactor enclosure, the method comprising the steps of: [0003] depositing a pre-surfacing weld having a closed contour around the defined area on the inner surface; [0004] placing a cover at the defined area; [0005] A weld is formed to weld the cover to the pre-surfacing weld. [0006] EP691658 describes a repair method for the replacement of tubes penetrating the bottom of a tank containing a nuclear reactor core. [0007] The pipe body, also known as the bottom penetration pipe, is used to introduce detectors such as neutron detectors or temperature detectors into the reactor core, or to remove the detectors from the reactor core. [0008] The method in EP691658 does not enable volume inspectio...

Claims

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Application Information

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IPC IPC(8): G21C13/036G21C13/067
CPCG21C13/036G21C13/067Y02E30/30
Inventor 布赖斯·马萨扎
Owner FRAMATOME ANP
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